Happening repeatedly (9)
I believe the answer is:
recurrent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">happening repeatedly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for recurrent that I've seen before include "Periodical" , "Happening often" , "Repeated again and again" , "Periodic" , "Happening repeatedly" .)